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|Title:||Blountstown Reach, Apalachicola River : movable-bed model study|
|Authors:||United States. Army. Corps of Engineers. Mobile District.|
McCollum, Randy A.
Dredged material disposal
|Publisher:||Hydraulics Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-88-17.|
Abstract: The Blountstown Reach, Apalachicola River, is located between navigation miles 81 and 76. This area requires approximately 107,000 cu yd of dredging annually to maintain the navigation channel. The model study was conducted to examine the dredged material disposal in the thalweg and within the bank and to develop a system of contraction works to develop and maintain the navigation channel with little or no maintenance dredging. The model, built to a horizontal scale of 1:120 and a vertical scale of 1:80, was of the movable-bed type and allowed for inflow from both the Apalachicola River and Sutton Lake. The three phases of the model study were as follows: (1.) Thalweg disposal - Disposal of dredged material in the deep portion of the bendways. (2.) Within-bank disposal - Disposal of the dredged material within the waterline and no closer than 100 ft from the navigation channel. (3.) Contraction works. Use of training works to contract channel width and improve sedimentation conditions. Plan A was the initial plan suggested by the Mobile District that was modified to improve its efficiency. Plan B was a progressive development of training works. Results of the study indicate the following. (A.) Thalweg disposal of dredged material had little effect on channel maintenance during low- or average-water years; but following high-water years, dredging would be significantly greater. (B.) Within-bank disposal of dredged material provided some improvement of the navigation channel during low- and average-water years, but required much more dredging than typical following high-water years. (C.) Plan A provided little improvement in maintaining a navigation channel. (D.) Plan B (B-14) developed and maintained an adequate navigation channel during all water years tested except for a marginal channel crossing at mile 77.40.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Technical Report|